US3701118A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Optical storage medium & method of making & using
Assignee: NCR Voyix Corp
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Filing: 1971-07-23
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Granted: 1972-10-24
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Expires: 1991-07-23
Abstract
Abstract This disclosure is directed to a reversible, yet optionally permanent dual electro-optical record and storage medium, bistable in both the optical and electrical modes and nonvolatile in the electrical mode having high resistivity contrast in the electrical mode between the write and erase states, high resolution and contrast in the optical mode between the write and erase states, high resolution and contrast in the optical mode between the write and erase states. The record medium can be used for display purposes and is capable of high bitpacking density and thermal micro-recording and erasure and comprises a fired ceramic glaze containing an intimate mixture of reducible lead oxide and reducible copper oxide as a major component and silica and alumina as minor components and wherein the mole ratio of lead (as lead oxide) to copper (as copper oxide) can range from about 0.1 to about 12.0:1. Magnesia can be included in said glaze as a minor component.
Inventors
- 👤 James E O'connor
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 09:00
CPC Classifications
G; G11; G11C; G11C13/00; G11C13/04; G11C13/048; C; C03; C03C; C03C4/00; G03; G03C; G03C1/00; G03C1/705
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
115 words
A reversible yet optionally permanent, dual electro-optical record and storage medium bistable in both the optical and electrical modes and non-volatile in the electrical mode having high resistivity contrast in the electrical mode between the write and erase states, high optical resolution and contrast in the optical mode between the write and erase states and capable of high bit-packing density and thermal micro-recording and erasure comprising a fired ceramic glaze containing an intimate mixture of reducible lead oxide and reducible copper oxide as a major component and silica and alumina as minor components and wherein the mole ratio of lead (as lead oxide) to copper (as copper oxide) ranges from about 0.1 to about 12.0:1.
Claim 2
Dependent Claim
115 words
A reversible yet optionally permanent, dual electro-optical record and storage medium bistable in both the optical and electrical modes and non-volatile in the electrical mode having high resistivity contrast in the electrical mode between the write and erase states, high optical resolution and contrast in the optical mode between the write and erase states and capable of high bit-packing density and thermal micro-recording and erasure comprising a fired ceramic glaze containing an intimate mixture of reducible lead oxide and reducible copper oxide as a major component and silica and alumina as minor components and wherein the mole ratio of lead (as lead oxide) to copper (as copper oxide) ranges from about 0.1 to about 12.0:1.
Claim 3
Dependent Claim
16 words
A medium as in claim 1 wherein said fired glaze incLudes magnesia as a minor component.
Claim 4
Dependent Claim
32 words
A medium as in claim 1 wherein a substantial portion of the lead oxide in selected areas of a major surface of said medium is present in the reduced form as lead.
Claim 5
Dependent Claim
33 words
A medium as in claim 3 wherein a substantial portion of the lead oxide in selected areas of an additional major surface of said medium is present in the reduced form as lead.
Claim 6
Dependent Claim
33 words
A medium as in claim 1 wherein a substantial portion of the copper oxide in selected areas of a major surface of the record medium is present in the reduced form as copper.
Claim 7
Dependent Claim
34 words
A medium as in claim 5 wherein a substantial portion of the copper oxide in selected areas of an additional major surface of the record medium is present in the reduced form as copper.
Claim 8
Dependent Claim
27 words
A medium as in claim 1 wherein the mole ratio of lead (as lead oxide) to copper (as copper oxide) ranges from about 2 to about 5:1.
Claim 9
Dependent Claim
27 words
A medium as in claim 7 wherein the mole ratio of lead (as lead oxide) to copper (as copper oxide) ranges from about 3 to about 4:1.
Claim 10
Dependent Claim
57 words
A method of preparing the record medium of claim 1 comprising mixing lead oxide and copper oxide in a mole ratio of about 0.1 to about 12.0:1 respectively, depositing said mixture on a ceramic substrate containing silica and alumina as essential components and firing said glaze at temperatures ranging from about 1,000* C. to about 1,400* C.
Claim 11
Dependent Claim
48 words
A method of writing and storing data areas in both optical and electrical modes comprising heating a preselected area(s) of the record medium of claim 1 to temperatures ranging from about 600* C. to about 900* C. in the presence of a reducing medium and removing said heat.
Claim 12
Dependent Claim
22 words
A method as in claim 10 wherein said writing is conducted at temperatures ranging from about 700* C. to about 800* C.
Claim 13
Dependent Claim
40 words
A method of erasing data areas stored in both optical and electrical modes in the medium of claim 1 by subjecting such data areas thereof sought to be erased to temperatures ranging from about 150* C. to about 550* C.
Claim 14
Dependent Claim
22 words
A method as in claim 12 wherein said erasure is conducted at temperatures ranging from about 250* C. to about 450* C.
Claim 15
Dependent Claim
33 words
A method of erasing data areas stored in both optical and electrical modes in the medium of claim 1 by contacting such data areas thereof sought to be erased with an oxidizing agent(s).
References Cited (Backward Citations)
US3568167A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-10-24 | 1976-04-24 | 1976-10-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-10-24 | 1980-04-24 | 1980-10-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-10-24 | 1984-04-24 | 1984-10-24 | $7700.00 | Window Closed / Lapsed |